Size of data generated when building lightning

Hello everybody,

I would like to use some of my servers to make light building faster, I use Hamachi to create a virtual LAN and Swarm is running on all machines (Coordinator also shows them already, so this is working).
My question is, how big are the data that will be transferred to the servers to build the lightning so I can calculate if is useful to use the servers (because less data means low transfer time and much time saving using the servers) or not (much data needs to send, much transfer time, using servers not worth it).
Maybe as example, how much data is generated when building the Sun Temple scene from Epic Games on Production Quality? (I am currently unable to use UE4 since I am not at home, so I can not test)

It depends on the map, as far as what’s getting sent over.

But, I would imagine that unless you have a level with next to nothing in it then it would always benefit to have extra machines to help build lighting, even if it’s only taking 30 minutes to build the lighting, maybe you can cut that down to 15 minutes.

I tried building light now, but it seems that the Coordinator does not want to split the work even if it would take several hours to use my machine alone (Sun Temple Scene; Production Lightning).
The coordinator shows both machines.